What to clean the soot in the boiler

What to use to clean the chimney. How to clean the chimney from soot and plaque folk remedies and methods

Special products for washing ovens are gaining in popularity. They are able to clean the walls of the cabinet of old soot and burnt grease traces. When choosing a suitable remedy, specify what material is made of the furnace. Most often it has an enamel coating. Make sure the product does not contain acids. Such products quickly remove stale grease, but can damage the surface of the furnace.

Read more: How to remove grease from a pan

  • Be sure to wear rubber gloves. Such detergents are very aggressive and can leave skin irritations.
  • Pour warm water (at least 80 degrees) in a large basin, add 15 ml of detergent and soak pans, shelves and racks. They are the ones that suffer the most from burnt on grease.
  • Take a soft sponge, moisten it, apply the cleaner, and go over all the insides of the oven. Do not treat the heating elements. You can wipe them with a damp cloth.
  • Run the oven for 10 minutes for best results. A high temperature will help stale grease to soften quickly. After you turn it off, use a damp sponge to rinse it off. If done improperly, the subsequent cooked dish can have an unpleasant smell and be hazardous to health.

Combustion products and their cause

By-products that appear in the combustion process are:

The reasons for the appearance of these substances are the following important points:

  • Causes of soot appearance:
  • Not enough oxygen for the combustion process;
  • the temperature of fuel combustion is too low.
  • Factors affecting the appearance of tar:
  • low-quality fuel is used;
  • the fuel material has a high degree of moisture;
  • Boiler is operating at a low temperature;
  • Too much fuel is loaded into the furnace.
  • Soot appears in the following cases:
  • Poor injection of air flow into the combustion chamber of the pyrolysis boiler;
  • Improper design of the unit
  • low chimney height.

As we can see, the main causes of harmful substances are bad fuel and technical organization of the combustion process.

Specialists advise: use only high quality fuel. otherwise the wear and tear of the boiler will rapidly increase.

Disassembly and soot removal

For the effective operation of the equipment it is necessary to clean the gas heater. Scaling on the walls can disrupt the smooth operation of the device, so do not wait for complete failure of the equipment, you should periodically carry out preventive cleaning.

Before starting the disassembly it is necessary to cut off the gas and water access. Cleaning of a gas boiler with your own hands begins with the removal of the boiler door and disconnecting the ignition wire. Then the thermocouple, piezo element and burner tube are removed

Carefully take out the nozzle and the burner itself

Thermometer liner, boiler cover and gas duct are removed. Cleaning of the gas water heater is carried out with the help of a scrubber and brushes, with which all the internal and external elements are cleaned. The nozzle hole is cleaned with a needle with a smaller diameter to avoid enlarging the hole and disruption of combustion. The internal channels of the heat exchanger are blown with a vacuum cleaner and wiped with a damp cloth.

At the same time you can make minor repairs to the heat exchanger with your own hands: replace the gasket under the pilot burner, check the thermocouple, which is prone to breakdowns due to the specifics of operation, and other. Such work does not require a large investment, but maintain the performance of the boiler at a high level, and the thermocouple device is quite simple, and replacement of the element will not be difficult.

Assembly is performed in the reverse order. When connecting the piezo element it is recommended not to use a tool to avoid damaging the ceramic base, it is better to screw it by hand.

When installing it is necessary to check the thermocouple on the gas boiler, you must know that the end of the conductors should be at the level of where the flame appears.

Why the chimney is clogged

Chimney clogging is a natural process resulting from combustion. Only part of the fuel, breaking down into fractions, becomes gaseous and exits, as an emission, into the atmosphere.

Other fragments with a heavier, dense structure take the form of a soot plaque and settle on the inner surface of the pipeline, over time repeatedly worsening its flow capacity.

Use of firewood from coniferous trees provokes clogging of ducts. Heavy resinous substances, in excess in the composition, form a powerful sticky base and contribute to the retention of soot deposits on it.

Such contaminants are difficult to clean with preparations and require careful removal by mechanical means.

Household garbage, packing containers, the remnants of old furniture, textiles and other items that are not a fuel resource by definition, during combustion emit caustic ether complexes, heavy carcinogens and tar compounds.

Therefore, the burning in the furnace or fireplace of such human waste products negatively affects the operation of heating equipment of any class.

All in the form of a dense, viscous sludge covering the inner surface of the pipes and creating conditions for soot, carbon black and soot retention. The channel through which the gaseous elements escape into the atmosphere is narrowed to a minimum, the draft is overturned, and some of the smoke enters the living space.

The temperature in the room drops and the use of heating equipment becomes dangerous due to the risk of carbon monoxide poisoning.

Accelerate clogging of the chimney duct by deposits of wood from recently cut, dried out wood.

clean, soot, boiler

If the current humidity of a log exceeds 12%, it is strictly forbidden to throw it into the furnace immediately. It is necessary to dry it thoroughly in a warm room for at least 1 week.

Damped log by 35% reduces the level of heat transfer, contributes to the rapid clogging of the chimney system, and over time, puts it out of operation.

Sometimes active accumulation of soot inside the chimney is provoked by mistakes made accidentally or inexperienced in the process of laying the firebox and arrangement of the chimney for a fireplace or stove.

  • Incorrectly calculated angle of inclination of the chimney;
  • Too thin walls of the flue system;
  • Improperly selected chimney pipe;
  • Increased volume of condensation formed due to inadequate thermal insulation;
  • Excessive amount of bends and curves in the flue path;
  • Roughness on the inner surface of the flue ducts.

These are the reasons that accelerate the contamination of chimneys and several times reduce the efficiency of furnaces, boilers and fireplaces. Homeowners are advised to be very careful in selecting stove-sweepers and only turn to those who have already confirmed their skills and high qualifications.

Otherwise, with enviable regularity will arise the question of how to clean a home chimney, giving you a lot of trouble and requiring constant financial costs.

Boiler cleaning tools

To qualitatively perform the cleaning of gas equipment from soot and carbon deposits, you need, first of all, to have the necessary set of tools.

Soot Blower.

This kit should include:

  • metal ruff or brush for the boiler;
  • Brush brush for the chimney can be plastic or metal;
  • holders for brushes of different lengths;
  • scrapers;
  • a steel rope;
  • Special hooks.

Having the necessary set of tools, you can directly proceed to the cleaning of the boiler and chimney.

You may also be interested in the article on how to flush a private home heating system.

Cleaning the gas boiler

Boiler cleaning is required if it is found that there are certain negative aspects in the work of the unit. In most cases, this manifests itself in the form of such features:

  • The temperature has dropped sharply, and the device works in a stable mode.
  • Increased consumption of energy resources (gas, electricity).
  • Unpleasant smell of fuel decomposition products has appeared.

In most cases such situations are caused by clogged elements of the device. To independently determine the exact location of the problem you should familiarize yourself with the design features of the specific boiler.

Important! These can be found in the operating instructions provided by the manufacturer.

In a gas heating boiler, there are a number of nodes that require regular maintenance and periodic cleaning. These include:

Working with each unit requires certain knowledge and skills, but some actions can be performed by yourself.

Important! If you are in doubt, contact a certified professional or gas service technician.


The main criterion indicating the quality of operation is the color of the flame and its even burning. If the flame has a yellowish tint or periodically comes off the nozzle, this is the first sign of the need to clean the boiler. To do this, you need to perform the following procedures:

  • Shut off the gas supply.
  • Remove the bolts or screws securing the igniter to the main structure of the boiler and remove it from the furnace.
  • Using a metal brush clean it from traces of carbon deposits and soot.
  • Blow out loose particles thoroughly. It is desirable to do it with a compressor, if it is not available. using other available means.
  • Return the igniter to its original position.

After the carried out cleaning of the boiler igniter the color of flame should change to blue. If there is no reaction, it means that there are unclean particles inside the assembly. Repeat the described procedure one more time.

Burner and nozzle

The need for cleaning of this assembly shows similar signs. Flame color changes, unstable combustion appears, frequent stoppages. To carry out the procedures it is necessary to cut off the gas supply, dismantle the assembly and clean it with a plastic brush.

Important! When cleaning the igniter, a brush with metallic bristles should have been used, but they should not be used in this case.

After careful blowing, assemble the assembly and check the quality of combustion.

If works are carried out in the non-heating period and there is a possibility to remove the element for a long time, you can use another way. After dismantling, soak the element in petrol, thinners, thoroughly moisten it with WD-40 or other substances for removing carbon deposits. After drying and thoroughly blowing out the burner and nozzles, set in place and check the results.

Important:! Installation after flushing with flammable agents (gasoline, solvent, kerosene, white spirit) is allowed only after the element is dried out and completely weathered. Any concentration (drops, vapours) of substance on the surface of the burner is not allowed and can cause an explosion.

Gas filter

Install the gas filter on the gas supply pipe. To dismount it is necessary to cut off gas supply by means of the shutoff valve, remove the element with a properly sized spanner.

Having disassembled the device into separate elements, wash them with running water, dry and assemble in reverse order. Its purpose is to clean the gas supplied from the main pipeline (or cylinder). Possible slag, rust and other foreign particles are deposited in the filter element and do not get into the main nodes of the boiler equipment.

External cleaning of the heat exchanger

The efficiency of heating equipment is evaluated by the rate of heating and the flow of energy carrier. The heat exchanger in this case plays one of the key roles. On how quickly its walls and the coolant inside will be heated and will depend on the performance of the heating system.

It is in direct contact with the burner flame. Therefore, the presence of soot on it, it is a normal situation. In this case, cleaning of boilers is carried out as follows:

  • Turn off the gas supply.
  • Dismantle the heat exchanger (the order of removal depends on the specific model, find it in the instruction manual).
  • Perform cleaning.
  • Reassemble in reverse order to removal.

The cleaning process can take place in different ways:

Cleaning a heat exchanger for limescale

The above-mentioned surface method of cleaning the heat exchanger of the boiler is the easiest and least expensive method. For maximum results, it is recommended to clean the inside of the element. This is done by flushing the tubes with chemical or hydrodynamic methods.

Cleaning of boilers from scale with chemistry, is carried out by rinsing the inner tubes with aggressive detergents and a circulating pump. The following products can be used for this purpose:

  • Citric acid. the simplest and least expensive method. 200 g of powder is diluted in 10-11 liters of water heated to 60-80 ° C and run through the system.
  • Thermagent Aktiv. a special liquid designed to flush the heat exchanger. Cleans scale, salt and other deposits. Dilute in the ratio of 1 to 8, preferably with warm water. Approximate cost of the canister 10 l. 1 600-1 700
  • Steeltex Cooper. no less effective product, designed for similar purposes. The ratio with water is determined depending on the degree of contamination. It is sold in five-liter canisters, costing 1,400-1,500
  • Detex is designed for cleaning of limescale and scale in steel, cast-iron and copper heat exchangers. The concentrate is sold in canisters of 10 liters at 4 300. 4 500

When and for what to clean the chimney

Regular cleaning is necessary for the chimneys of furnaces and fireplaces that run on solid or liquid fuels. When it burns, ash is formed, which remains in the furnace, as well as soot deposited on the inner surface of the chimney. Its quantity depends on the type of firewood, burning temperature, frequency of heater use and other parameters.

clean, soot, boiler

But if it is easy to check the condition of the furnace, you can only know what is happening in the chimney after the revision. If the heater is constantly in operation, it is necessary to check it at least twice a year. before the heating season (at the end of summer) and after it (in spring).

According to the results, it is decided how to clean the chimney. drastically, using mechanical means, or you can do with less time-consuming ways. This depends on the thickness of soot on the walls and the presence of foreign objects in the channel, such as dry leaves, birds’ nests and other debris. If they are there, and the plaque has grown more than 2-3 mm, you need a major cleaning.

clean, soot, boiler

If it is not made, the following unpleasant consequences are possible:

As soot overgrowth narrows the chimney aperture, the smoke can no longer flow freely outside, so part of it is trapped in the furnace, penetrating into the room and worsening combustion. This is also promoted by poor heating of the chimney walls, due to which the draft decreases;

  • Carbon monoxide that enters the room often causes severe and fatal poisoning;
  • A thick layer of soot in the pipe can catch fire, and the red-hot sparks flying out of it can cause a fire;
  • smoke penetration into the house even without serious consequences. it is an unpleasant smell and soot on all surfaces.

Cleaning Ways

There are three ways to clean a solid fuel boiler from soot, tar and tarring: mechanical, steam and chemical.

Either method has its own distinctive features. Let us look at each of them.


The process of mechanical cleaning of the boiler is based on the removal of combustion products from the walls of the unit with special tools. For this purpose, the following are used: pokers, scrapers, spatulas, metal brushes, ruffs.

Do not forget that you need to start the process of cleaning the boiler from soot only after the device has completely cooled down.

It is important that in the process of cleaning the boiler from soot, the flap was not closed.

Remove tar and tar from the walls of the unit as follows:

  • Initially, the heater must be warmed up. Tar and tar are quite hard, and when the boiler is heated they soften and it becomes easier to get rid of them.
  • Next, using spatulas and scrapers, it is necessary to get rid of these deposits.
  • After the cleaning process is complete, you need to increase the temperature of the boiler. This is done so that the tar and tar residues burn out.


This method of cleaning solid fuel boilers is very popular. It is based on the use of different chemical compositions.

To clean the unit with a chemical agent, you need to heat the reagent and use a special pump to fill it into the boiler system.

The most commonly used acids are: sulfamic, adipic, helium.

Adipic acid is diluted with water and pumped gently into the boiler. Once in the device, the mixture reacts with the deposits, converts into acidic salts and dissolves. In the next step, you must release the pressure and wait until the salts have precipitated, and then rinse them off with water.

Sulfamic acid is also diluted with water, only in a separate container. It then has to be pumped into the cooled down boiler under pressure. Next you need to wait some time for the acid to react with the plaque and rinse the unit.

The gel is not an acid. But it is also effective in removing deposits from the boiler without damaging its walls.

In order to clean the chimney from soot, most often used rock salt. It is added to the furnace at the moment when the fuel burns. However, this method is used only for preventive purposes. Completely get rid of soot with it. it is not possible.

effective in the fight against soot are potato peels. The method is as follows: while the fuel is burning, they must be poured into the combustion chamber. The starch will be released along with the steam. It is at the expense of it soot will soften and will be removed from the chimney. After completing this procedure, the boiler should be well cleaned.

When carrying out cleaning of the solid fuel boiler by chemical means, the safety precautions must be strictly observed.



This method involves treating the walls of the solid fuel boiler with a steam generator. This way you will not only get rid of dirt, but also of fungus and mold in your heater.

So, you can clean the boiler from tar, soot and tarring by any of the offered methods. One of them will take more time and require a lot of effort from you. Others allow you to quickly get rid of deposits, but will be more expensive. Either way, it is your choice. The main thing is not to forget to clean the solid fuel boiler regularly, because the efficiency of its work will depend on this.

| Denial of responsibility | Contacts |RSS